The island is a very popular summer destination, this was a rare shot of the main route through the fortress when it was not clogged with Chinese tour groups! Finns seem to come for picnics, and they hang out on the beaches and wild spaces.
During WWII (The Continuation War, as the Finns call it.) a series of modern positions were added, anti-aircraft guns and naval guns. Each one had a protected position, crew shelters, and ammunition caches.